iPod - iPod playlist question

I have a 3rd gen iPod 20gb. Is there a way to shuffle a playlist on the iPod?

I have all of my iTunes library on my iPod, and several playlists, including a large one without the music/podcasts of the others in it. I want to shuffle that large list, and not listen to everything sequentially.

Going out to the main menu and selecting shuffle just shuffles the entire contents of the iPod, which is not what I want. When I'm out riding I don't want it to randomly select a podcast when I want music that is a bit more...athletic inducing.